Door-closure mechanism



:s sheets-sheet'- f1Y T. BRADY DOOR cLosURE MEGHANISM Flled May 2, 1923Deco N www T. BRADY DOOR CLOSURE MECHANISM Dec. 22, 1925 1,566,366

Filed May 2, 1923 5 Sheets-Sheet. 2

uantoz T. BRADY DOOR CLosURE MECHANISM Filed May 2, 1923 5 Sheets-Sheet5 Patented Dec. 22, 1925.

YUMTED STATESY DELAWARE.

PATENT onirica.

THOMAS BRADY, OE EAST ORANGE, NEW JERSEY, ASSIGNOR TO BRADY ELEVATOREQUIPMENT COMPANY, INC., OF HOBOKEN, NEW JERSEY, A CORPORATION O FDoon-CLOSURE iifrncHANIsM.y j

Application filed May 2, 1923.. Serial No. 636,04?.

To all whom it may concern Be it known that I, THOMAS BRADY, a citi- Zenof the United States, and a resident of .East Orange, county ofEsseX,and State of New Jersey, have invented certain new and usefulImprovements in Door-Closure Mechanism, of whichl the following is aspecification.

This invention relates to door closures for elevator hatchways.

It is very essential that the closure mechanism for elevator hatchwaydoors be so con# structed and arranged that the `door can not be openedfrom the floor landings.

When lever mechanism or other latching mechanism is used the door is notlatched unless it is entirely closed and therefore if the door is leftpartly Y. opened it can be opened from the floor level.

To overcome this condition rack and pawl mechanism has been used toprevent the door being opened until it has been entirely closed. Thisarrangement,l however, has been objectionable because of the noisyoperation of the rack and awl.

This invention has or itssalient object to provide rack and pawl doorcontrol mechanism so constructed and arranged that it will operatenoiselessly.

Another object of the invention is to provide mechanism of the charactervdescribed that will operate effectively and can be economicallyvmanufactured.

Further objects of the invention will appear from the followingdescription taken in connection with the drawings which form a part ofthis application and in which, f

Fig. l is an elevational View illustrating a three panel door, lever.closure means an rack and pawl controlling means for the door. Y n vFig. 2 is a top plan view of the construction shown in Fig. 1,illustrating particularly the lever closure mechanism. n

Fig. 3 is an elevational view on an enlarged scale showing the rack andpawl mechanism illustrated in Fig. 1, these parts being shown in theposition taken when the door has not been entirely closed.

Fig. 4L is a sectional elevation taken at right angles to Fig. 3. y

Fig. 5 illustrates the position of the parts when an attempt has beenmade to open the door when it has not been entirely closed.

Fig. 6 is an elevational view showing the Yshown in Figs'. 6 and 7, and

Fig. 9V is a top plank `view of the rack shown in Figs. L5. y j I Theinvention briefly described consists of a rack and pawl, one of thesemembersV being mounted on the door or on aY slidable door section andthe other member being l is a sectional-'elevation taken at L mounted ona stationary support in' the' hatchway. The pawl is provided with ,asloot adjacent the toothed end thereof and in the slot is mounted a pinupon which are mounted rollers. When the door is opened the rollers willhold the pawl tooth in elevated position so that it will not en age therack and this action lwill also ta e lace when the door is closed.However, i? the door is not entirely closed but is nearly closed thepawl will be positioned as shown in Fig. 3 and any attempt to open thedoor from this position will cause the pawl tooth to engage the rackteeth. In the embodiment of the invention shown in Figs. 1-5

the pawl is pivoted on a stationary bracket and the rack is carried bythe door section. In the embodiment shown in Figs. 6`8 inelusive,however, the pawl is mounted on the door section and the rack isymounted on a stationary support. v

' In the embodiment of the invention illusd trated in Figs. 1*-5 and 9 athree-panel door prises a plurality of links A, B and C. The

link A is lpivoted at 13 to ,thedoor section l0 and the link B ispivoted at 14 to the link A. The link B is also pivoted at 15 to abracket 16 secured to the section 11. The link B and the link C arepivotally connected at 17 and tion ot the door operating mechanism.

the opposite Aend of the link C is pivoted at 18 to a lug 19 secured inthe elevator hatchway. In the particular form of the inventionillustrated in Fig. l a dash pot or cushion 20 is pivoted at 2l toanextension 22 formed on the link C in'order to secure a quiet operan.handle 23 is shown as secured to the link In order t-o open the door theoperator pulls downwardly on the handle 23 and the link B swingingtheparts to the. position shown in dotted lines wherein the sections l0and ll have been moved to a posit-ion overlapping the stationary sectionor panel l2. vIt will be understood that any other form of dooroperating means may be utilized it desired. Y

In the form ot the invention shown in Figs. linclusive and 9, the rack23 is mounted on the section l() adjacent the upper edge thereof and thepawl 29 is pivoted at 30 on a plate 3l secured above the hatchwayopening. It will be seen from the showing in Fig.' l that the pawl islocated in such a position that'it will swing 'freely on its pivot whenthe door is entirely closed or when the door is entirely opened.

The pawl 29 has formed therein adjacent the toothed end 32 thereof anelongated slot 33 in which is mounted a. pin 34 having mountedthereonrollers 35. In this form of the invention the rack has a pair ot' railsor tracks 36 onv which the rollers are adapted to run and the rack teeth37 are formed intermediate these rails. The tracks or rails 36 areflared at their ends as shown at 36a to guide the pawl into positionabove the rack. The under side of the rack is recessed as shown at 38and openings 39 are provided at the bases of the teeth to permit dustand dir-t to pass downwardly into the recess 38 from which this mattercan be cleaned out. The rack is secured to a bracket l0 in a positionslightly offset from the panel l0.

rIhe door is shown in Fig. l in full lines in its fully closed position.Then the door is opened the pawl 39 will be swung in an anticlockwisedirection and the rollers 35 will ride on the tracks 36 retaining thetoothed end A32 of the pawl out of engagement with the rack teeththereby providing a. noiseless operation. When the door is closed thepawl will be swung in a clockwise direction and the rollers 35 willagain ride on the tracks 36. It, however, the door is not entirelylclosed but is stopped in a position suoli as is illustrated in Figs. 3and 5 and the operator or some unauthorized person tries to open thedoor the pin 34 will ride upwardly in the slot 33 permitting the toothedend 32 of the pawlto engage one of thevrack teeth. In order to open thedoor therefore it will be necessary to entirely close it permitting thepawl to swing downwardly to the position shown 1n Fig. l.

The construction shown in Figs. 6, 7 and 3 is similar to that shown inthe preceding In this construction, however', the pawl 5l is pivoted at52 on a plate 53 secured to the botto-m of the door panel 54. rlhe rack55 is-mounted below the hatchway opening and is provided with two setsof rack teeth 56 and 57. At the ends of the track 62 the rack base isrecessed and llared as shown at 62a to guide the roller 6l into properposition on the track. This construction operates as l'ollows. Then thedoor is opened the roller will ride on the track 62 thereby ele\f'atingthe pawl above the rack. When, however, the door is closed in thedirection shown by the arrow in Fig. 6 the pawl will swing to theposition shown in t'ull lines and it. the door is stopped in theposition shown in this ligure and an attempt is then made to open it,the pawl teeth will engage the rack teeth.

Although certain specitic embodiments ot the invention have beenparticularly shown and described, it will be understood. that theinvention is capable of further modification and that further changes inthe construction and in the arrangement of the various cooperating partsmay be made without departing from the spirit or scope` of the inventionas expressed in the following claims.

lVhat I claim is 1. Pawl and rack mechanism comprising relativelyslidable members, a rack mounted on one of said members, a pawl pivotedon the other member, said rack and pawl being constructed and arrangedto prevent relative movement orp said members in one direction when thepawl engages the rack teeth, 'and means carried by the pawl forelevating the pawl above and out ot engagement with the rack teeth whenone of said members is moving relative to the other member, said meanspermitting the pawl to engage the teeth when the members are sorelatively moved as to move the pawl into such engagement.

2. Pawl and rack mechanism comprising relatively slidable members, arack mounted on one of said members, a pawl pivoted on the other member,,said rack and pawl being constructed and arranged to prevent relativemovement of said members in one direction when the pawl engages the rackteeth, and means including a roller carried bythe pawl for elevating thepawl above the rack teeth when one ot said members is moving relative tothe other member, said means permit-ting the pawl to engage the teethwhen the members are so relatively moved as to move the pawl into suchengagement.

3. Pawl and rack mechanism comprising relatively slidable members7 arack mounted on one ot said members, a pawl pivoted on the other member,said rack and pawl being constructed and arranged to prevent relativemovement of said members yin one,

direction when the paWl engages the rack teeth, and means includingrollers carried by the pawl for elevating the pawl above the rack teethWhen one of said members is moving relative to the other member, saidmeans permitting the paWl to engage the teeth When the members are sorelatively moved as to move the pawl into such engagement.

4. Pavvl and rack mechanism comprising relatively slidable members, arack mounted on one of said members, a pawl pivoted on the other member,said rack and paWl being constructed and arranged to prevent relativemovement of said members in one direction When the paWl engages the rackteeth, and means including rollers carried by the paWl and movablebodily relative thereto, for elevating the paWl above the rack teethwhen one of said members is moving relative to the other member, saidmeans per y mit-ting the paWl to engage the teeth When the mmbers are sorelatively moved as to move the paWl into such engagement.

5. Pawl and rack mechanism comprising relatively slidable members, arack mounted on one of said members, a paWl pivoted on the other member,said pavvl having a longitudinal slot therein, a pin loosely mounted insaid slot and rollers mounted on said pin.

6. PaWl Vand rack mechanism comprising relatively slidable members, arack mounted on one of said members, a pawvl pivoted on the othermember, and a roller carried by said paWl and movable bodily relativethereto and longitudinally thereon.

7. Pavvl and rackmechanism comprising relatively slidable members, arack mounted on one of said members, a pavvl pivoted on the othermember, and rollers carrier by said pavvl and movable bodily relativethereto and longitudinally thereon.

8. In combination, a rack having teeth formed thereon and having a trackdisposed 'adapted to roll on said track.

`parallel )to said teeth and a paWl having a tooth adapted to engage therack teeth and a roller slidably mounted thereon and adapted to roll onsaid track.

9. In combination, arack having teeth formed thereon and having a trackdisposed adjacent to said teeth and a pawl having a tooth adapted toengage the rack teeth and a roller slidably mounted thereon l and l0. Incombination, a rack having teeth formed thereon and having a trackdisposed adjacent to said teeth and a paWl having a tooth adapted toengage the rack teeth and a roller slidably mounted thereon and adaptedto yroll on said track, and means for retaining the roller on the track.

11. In combination, a rack having teeth formed thereon and having atrack disposed adjacent to said teeth and a paWl having a tooth adaptedto engage the rack teeth and a roller slidably mounted thereon andadapted to roll on said track, and means for guiding the -roller to andretaining the roller on the track. Y

12. In combination, a rack having teeth formed thereon and having tracksdisposed j adjacent to said teeth and a paWl having a' tooth adapted toengage the rack teeth and rollers slidably mounted thereon and adaptedtoroll on said tracks. V

13. PaWl and rack mechanism comprising relatively slidable members, arack mounted on one of saidmembers, a pawl pivoted on the other member,said rack and pawl being constructed and arranged to prevent relativemovement of the members in one direction when the pawl engages the rackteeth and means for elevating the pawl above and oulof engagement withthe rack teeth when relative movement of the members takes place in theopposite direction.

my hand this 30th day of April, '1923.

THOMAS BRAD Y.

